Western Digital has been on our watch list since they sent us their (then) flagship 500 GB drive with seeks that we could hardly hear. This is the WD first drive sample that we've seen since, and it's unusual: Their PR says it's Green, low power, and very quiet. We confirmed that it spins at 5,400 RPM using frequency spectrum analysis; WD's code for this speed is "IntelliPower". Does lower rotation speed mean lower noise? You betcha!